In this ideal new world, students watch the videos and then use the in class time to work with others, collaborating with each other and their teachers.

And anytime they need to get a refresher on the subject, a short video will guide their way.

Each video tutorial is about 10 minutes long. Why 10 minutes? Because that's the limit YouTube placed on the original videos. But after posting, Khan has learned that a 10 minute video is the right amount of time to understand a topic.